What are the general principles of refrigeration?

Question

How can one calculate refrigeration loads?

Answer 1

i believe refrigeration working principle is the same as air-conditioning.

the refrigerant running in these cooling plants are the main factor.

refrigerants before the compressor (condenser) are hot and in gaseous state. after passing through the compressor (condenser), the refrigerant becomes cold and in liquid state. it will pass by the expansion valve in which the lower the refrigerant pressure and hence, will also lower the refrigerant's boiling point. so the cold liquid will be then delivered to the evaporator (the refrigerator itself) to do a heat exchange with the air inside. it will cool the air in the refrigerator and will take away the heat and back to the compressor (condenser).

Answer 2

I'm not really sure what you mean, but if you need to know how many watts of cooling you need, look at the insulation around the cooled area, it should be fairly simple to figure out an estimate of how much heat is conducted though the walls per second in joules- you need the same amount of refrigeration to keep the temperature stable.

Answer 3

This is a pressing issue which needs a lot of attention but unfortunately as a human race we are far more worried about control of fellow humans and our virtual world we built over several generations. Quite frankly "humans are a parasite to this world" and is only interested in extracting every ounce of resources available with no thought for other living organisms and not even of their own kind. We are too busy fighting each other for power and control over resources to the point that we do not care if we get a pie out of it but the other fellow should not be in control at any cost :) So in short this topic is well overdue and should be actively discussed but as always until a catastrophic event it’s not a topic of interest for most of the human kind. The world has survived several million years with various species and will eventually find a way to flush out the excesses. We need to learn to co-exist with nature or be prepared for an eventual end of the human domination.

Answer 4

A little bit here

http://cipco.apogee.net/ces/library/cromrl.asp

In general terms heat is given off in a condenser as a gas condenses into liquid under pressure, passes through a valve (or in very large industrial systems a turbo-expander) and takes in heat at a low temperature as it evaporates. The vapour is then compressed again in a compressor.

The energy balance is:

heat in in evaporator + work in in compressor = heat out in condenser

Answer 5

not really sure what u mean, but i DO know that a refrigerator works by the absence of heat instead of pumping cold air.

Answer 6

a hot to cold. High pressure to low pressure, give up heat to outside, and cooling effect inside

Discharge to Condensor - gas turns to liquid, and sucked backed by compressor and then into the evaporator as low pressure gas therby cooling.. The cycle starts all over again

Answer 7

generally heat has tendency to flow from high temperature to low temperature
BUT for refrigeration additional work is done to transfer heat from hot body to higher temperature surroundings
heat from the food is taken away to cool it

Answer 8

heat transfer from cold environment ( refrigrator) to warm environment(outer environment) that is it is disagreement with laws of heat transter. but by giving energy this is possible.

Answer 9

It dehumidifies

Answer 10

keep your food cold so it doesn't spoil